| 摘要 |
PROBLEM TO BE SOLVED: To efficiently use a regenerative energy.SOLUTION: A controller C, a control device of a hybrid construction machine, connects a pilot oil pressure source PP to pilot chambers of main changeover valves 14, 29 by controlling a first electromagnetic control valve 15 when a neutral signal is inputted from a neutral position detection means, changes over the main changeover valves 14, 29 to a second position on the left side in the figure, and connects first and second variable displacement pumps MP1, MP2 to a regenerative hydraulic motor M via the main changeover valves 14, 29. With the electromagnetic changeover valves 11, 27 held in a regenerative energy control position, an electromagnetic variable pressure reducing valve 13 is connected to regulators 12, 28. Through the control of the electromagnetic variable pressure reducing valve 13, a pressure acting on the regulators is controlled. When a drive signal for driving an assist pump AP is inputted, a second electromagnetic control valve 16 is controlled to change over the main changeover valves 14, 29 to a third position. |
